It should have been that, but Harris was campaigning heavily to the center and the center leaning right.
Fuck, they basically muzzled Tim Walz during the campaign. Did you notice how he was no longer allowed to call MAGA weird? I sure did.
Then there was the fact that Harris had to run on Biden's full platform. I know that she personally disagreed with parts, the unpopular parts. She was never really allowed to say it during the campaign.
But really, I mostly blame that little shit Crooks, you either get it right, or you don't do it at all. Trump used that survival to galvanize his base, and that's what an election needs to be in this divided world. Don't worry about the other side. We live in different realities and, they don't often intersect. You have to focus completely on your own base as much as possible. They're the one who will actually vote, if you can get them to care enough to do so.
Harris didn't do that. And that's why she lost.